Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[i386] Add data32 prefixes to all lgdt/lidt instructions
With a 16-bit operand, lgdt/lidt will load only a 24-bit base address, ignoring the high-order bits. This meant that we could fail to fully restore the GDT across a call into gPXE, if the GDT happened to be located above the 16MB mark. Not all of our lgdt/lidt instructions require a data32 prefix (for example, reloading the real-mode IDT can never require a 32-bit base address), but by adding them everywhere we will hopefully not forget the necessary ones in future.
- Loading branch information
Michael Brown
committed
Nov 7, 2008
1 parent
aa95744
commit 29e6f98
Showing
2 changed files
with
7 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters